Preheater



March 4 N. A. Aiwms ETAL 2,396,235

PREHEATER Filed Oct. 8, 1942 I ATTOREY Patented Mar. 12, 1946 PREHEATER Nathan; A. Aryins. and Abraham. A. Arvintz, Brooklym, N. Y;,, assignors: to; Blazei Corporal-- tion, avcorporation of N ew; York Application 'ctober8, 1942; Serial-No. 461,34

3 Glaims- This, invention relates. to preheaters adapted for; use. in preheating fuel oil; for supply to oil burners of. various, kinds and" classes. More particularly, the invention relates to an apparatus of, this classv wherein the qilpcircu atine are arranged'within a water chamber heated by an outer jacket through which steam. or boiler water is circulated. so as, to prevent contamination of the boiler. water. in the, event; of a. leak occurring in the. oil circulating tubes. Thenoveli features of, the invention will be, best understood from the following description when taken, together with the accompanying drawing in which, cer.-

tain embodiments of the. invention are disclosed, and" in, which, the, separate parts are designated by suitable reference characters, the, drawing being a longitudinal sectional view througha preheater made according to our invention,

Fig. l is a sectional view thro gh a, nreheater made according to our invention; and: Fig. 2 is, a cross-section on the broken line 2-2 of Fig. 1.

In. the accompanying drawing, I represents an inner casing, the walls off which are, prefer,- ably corrugated. This casing isclosed at one end, as seen at 2, and the other end of the easing has; an outwardly projecting annular flange 3, and an inwardly projecting flange portion 4, ghe latter having inlet and outlet passages and Arranged outwardly of the casing I, and in spaced relation thereto, is a jacket I which is also corrugated to correspond and match with the corrugations of the casing I. The jacket is closed at one end, as seen at 8, except for clean out passages controlled by plugs 9. The jacket has apertured bosses for receiving inlet and outlet circulating pipes Ill and II, whereby steam, boiler water, or the like may be circulated through the chamber I2, formed between the casing I and the jacket I. The other end of the jacket I, also has an inwardly projecting annular flange adapted to be secured to the flange 3 by bolts The bolts M, also pass through flanges I5 of an oil and water distributing casing or header I6, and suitable packing gaskets I! and I8 are arranged between the flanges 3 and I3, and 3 and I5 respectively.

The casing I6 is divided by a partition I9 into oil inlet and outlet chambers 20 and 2|, with which inlet and outlet pipes 22 and 23 respectively communicate. The casing I6 has an inwardly tapered or conical wall 24 terminated at its inner end in a recessed seat 25, upon which a tube sheet or plate 26 is adapted to be supported and retained, Suitable packing 2I'is empl'oyed between the plate, 26, and the seat 25. The packing 2''! also extends to the inner surface of the partition I9.

Formed, outwardly of the wall" 24 is a water chamber 28 to which an inlet pipe z9icommunicates for supply of city or other water to.v the chamber 30 of the casing I', through the port 5. An outlet pipe 3I also communicates with the chamber 28, as shown.

The gasket It! also extends between the plate 26, and the flange 4 of the casing I, as seen at 32: The plate 26'supports a plurality of oil circulating tubes 33, which arev adapted to circulate oil from the chamber or compartment 29 to the chamber or compartment 21I.

In referring to the apparatus asan oil preheater, it will be understood that this illustration is given. basically to demonstrate one adaptation of the invention, and the apparatus may be used as a preheater or heat exchanger of any type and kind in conjunction with various types and kinds of fluids or gases.

From; the foregoing description it will appear that the apparatus, is composed of four primary parts or units, the inner casing comprising. one

part, the jacket 1 another part; the casing I6 the third part, and the tube plate 26 including the tubes 33 which are a unit part of this plate, the fourth part. These parts are of simple construction and may be readily coupled and uncoupled, it being understood that the parts I and I, as well as the tube unit 26-33 are all detachable from the casing I6 without disturbing any of the fittings or fixtures coupled with the casing I6. It will thus appear that the apparatus may be cleaned and repaired in a simple and practical manner, as and when required. The chamber I2 may be cleaned out by removal of one or both of the plugs 9, and in some instances, the passages controlled by said plugs may be utilized for circulating purposes, depending upon the nature of the installation.

On the closed end wall 2 of the casing I, is an elongated tubular socket 34 and coupled with the closed end wall 3 of the housing or jacket I is a pin or stud 35, which fits the socket 34 to form a support and guide for the closed end tube of the casing I. In this connection it will be understood that the corrugations formed in the wall structure of the casing and jacket will care for expansion and contraction to which these tubular structures may be subjected in the use of the apparatus, and any differential in this expansion and contraction as between the casin and jacket will be compensated for by the sliding support which is provided at 34-35.

It will also be apparent that by providing the corrugated wall structure the greatest possible area may be provided in the walls of the casing as well as the walls of the jacket or housing, while minimizing the overall length of these parts. In any event a greater efiiciency can be accomplished in heat transfer within a minimum space, of course, where larger units are necessar to care for the volume of material or substance handled, suitable capacities will be provided.

By employing the chamber 28, it will appear that a jacket or housing is provided around the intake chamber and exhaust chambers 2|. This construction produces greater efficiency by reason of the fact that the heated water or other heat transfering medium is exposed to the greatest degree to the fluid introduced or circulated through the coils and which passes through the said intake and exhaust chambers.

It will also appear that the apparatus as disclosed may be used simply as a heat exchanger by employing the casing, with the coils arranged therein, in other words, the outer jacket may be eliminated. In such installations, the heating medium may be circulated directly to the chamber of the casing.

Having fully described our invention, what we claim as new and desire to secure by Letters Patent is:

1. A preheater of the class described, comprising an elongated casing, a housing encircling the casing and spaced therefrom to form a circulating chamber between said casing and housing, a distributor casing at one end of said first named casing and housing, both of said casings and said housing being flanged, and fastening devices passed through said flanges in coupling the casings and said housing together, a tube plate supported between the first and second named casings inwardly of said flanges and having coils extending into the first named casing, said distributor casing having inlet and outlet chambers communicating with said coils for circulating a medium to be heated through the coils, means comprising a chamber in the second named casing enveloping the major portion of said inlet and outlet chambers for introducing a heat conducting medium into the first named casing around said coils, and means whereby a heating medium may be circulated through said circulating cham ber.

combination with inner and outer casings forming an inner tube chamber jacketed by a circulating chamber, of a header coupled with one end of said casings, said header having intake and exhaust passages through which a medium to be heated is adapted to be circulated, the header having a chamber jacketing said intake and exhaust passages, an inwardly projecting flange on said inner casing, means between the header and the flange of said inner casing for supporting circulating coils in said inner casing and in communication with said intake and exhaust passages of said header, and said flange having passages placing said header chamber in communication with the chamber of said inner casing,

3. A heat exchanger, comprising an elongated casing, a tube sheet having circulating coils arranged within the interior of the casing, a header closing the open end of said casing, means on said casing and header supporting said tube sheet between said casing and header, said header having intake and exhaust passages communicating with said coils, said header and the intake and exhaust passages thereof having spaced substantially parallel outer and side walls with a chamber therebetween, means bridging said chamber uniting the outer side walls of the header, said bridging means having intake and exhaust passages forming communications for a medium to be circulated through the passages and said coils, the first named means of said casing including passages placing said chamber of the header in communication with the interior of said casing, and said header having an intake and an exhaust communicating with the chamber thereof.

NATHAN A. ARVINS. ABRAHAM A. ARVINTZ.

2. In a preheater of the class described, the 

